Present atmospheric methane (CH4 ) concentrations are at approximately________ ppb
A) 750
B) 1000
C) 1500
D) 1800
D
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Squatter towns are often dangerous places to live because the land they are on is commonly
A. Close to new building construction zones B. Unstable, polluted, or near industrial sites C. Close to major highways D. In the densest parts of the city E. Owned by powerful political figures
Which one of the following principles of smart-growth will most likely result in more wildlife habitat and scenic beauty within established suburban neighborhoods?
A) Have states purchase open spaces that are then preserved from urban development. B) Set physical boundaries on urban sprawl. C) Build new homes and stores on existing abandoned or brownfield urban properties. D) Promote the integration of homes, stores, light industry, and professional offices.
To halt a pyroclastic flow, one could use many of the same techniques as are used for lava, because both are flowing fluids.
Answer the following statement true (T) or false (F)
A confined aquifer is defined as
a. an aquifer that traps porous rocks between layers of less permeable substrate. b. an aquifer that traps porous rocks under one layer of less permeable substrate. c. an aquifer with porous rocks resting on bedrock. d. an aquifer with no upper layer.